I Am Crying Right Now

My Best Friend and I fought today and I feel so bad that I can't stop myself from crying. I know that she just wants me to open up to her and tell my problems to her but I can't. I feel that I will be just adding up to her problems so that is why I am keeping it up for myself. I don't want her to worry about me because I know that she also has many problems to think about. But in the end I still hurt her and now she's mad at me. This is the second time I fought with her. She had been my best friend for five years now.